Grinder disc holder



FIG. 1 is a perspective view of a grinder disc holder showing my new design;

FIG. 2 is a top plan thereof;

FIG. 3 is a front elevational view thereof, the opposite side being a mirror image; and,

FIG. 4 is a side elevational view thereof, the opposite side being a mirror image. 

CLAIM The ornamental design for a grinder disc holder, as shown and described. 